Valve reseating tool



5 15 p I III"! II" 19 1 zi Dec. 28, 1937. R p NORTON 2,103,377

VALVE RESEATING I OOL 7 Filed Nov. 27, 1936 Patented Dec. 28, 1937 UNITED STATES PAT ENT OFFICE v y r 2,103,377- I VALVE RESEATING 'roon f Raymond '1. Norton, Alg ona, Iowa. I Application November 27, 1936, sm-a1 N6. 11am 2 Claims. (o1. al -403W The object of my invention is to provide a handoperated valve reseat'ing tool of simple, durable and inexpensive construction.

More specifically, it is my object to provide a tool of this'character in which the cutter blades are so constructed and arranged relative to each other that during anormal valve reseating operation the cutter blades will not gouge into a valve seat and the tool will not chatter, and whereby a smooth, level valve seat may be formed easily and rapidly.

Figure 1 shows a central longitudinal sectional view of a valve having my improved valve reseating tool in position for use in reseating the valve.

Figure 2 shows a plan view of the working face of the tool illustrating the positioning of the cutter blades.

Figure 3 shows a side view of the tool head.

20 Figure 4 shows an enlarged view of a portion of the tool head and a portion of a valve seat, and illustrating the manner in which the several cutter blades operate on the valve seat.

Figure 5 shows a view similar to Figure 2 illustrating a modification.

Figure 6 shows a view similar to Figure 3, illustrating the same modification; and

Figure 7 shows a view similar to Figure 4, illustrating the same modification. 30 Referring to the accompanying drawing, I have used the reference numeral II] to indicate generally a valve having a valve seat H and a detachable bonnet l2 of the class now in common use.

My improved Valve reseating tool comprises a stem [3 of such length and diameter as to be extended through the valve stem opening of a valve and project a short distance beyond the bonnet. At its upper end is a detachable hand wheel l4.

At the opposite or lower end of the stem is a head l5 preferably circular in outline and having its lower or working face in a plane at right angles to the stem.

Formed on this working face are two groups of cutter blades, marked in Figure 3 as IE5 and IT. These groups are widely spaced apart, and each group occupies less than half of the working face of the head at diametrically opposite sides thereof. Each group is composed of a number of cutter blades arranged parallel to each other, the central cutter blade'being approximately radial to the center of the working face and the end cutting blades being shorter longitudinally than the central blades. By this arrangement of the: blades'I obtain ,the following results, as:

suming that the tool is being rotated over a valve seat in the normal manner for valve reseating, the

advance blade cuts only the outergportion of the Valve seat andthe remaining following blades .1

cuttthejentire valve seat surface. Furthermore, each blade is advanced over the valve seat at a, different angle relative to a radial line from the center of the cutter head.

The cutting faces of the blades are preferably hollow ground as shown at 18, the cutting edge being projected from the working face of the head further than the remainder of the blade.

The cutter blade in each group which is in advance of the other blades during the operation of the tool, is shorter in its dimension projected beyond the head than the other blades, as shown at IS in Figures 4 and '7.

In the modified form shown in Figures 5, 6, and '7 I have illustrated only one group of cutter blades, and on the surface of the head on the side opposite from the group of cutter blades I have provided a flat working face arranged in substantially the same plane relative to a line at right angles to the axis of rotation of the tool. In Figure 6 the plane of the working face 20 is shown by the line 2 I.

In practical use, and assuming that the tool was placed in a valve as shown in Figure 1, and assuming that the valve seat had a depression therein occupying, for instance, about one-third of the circumference of the valve seat. Then when pressure is applied to the tool and the tool is rotated, there would be a tendency for the tool to tilt in a direction toward said depression, and then as the advance blade of a group passed over the depression and reached the normal portion of the valve seat beyond the depression, said advance cutter blade would gouge into the valve seat. This is avoided in my presentreseatingtool by having the said advance blade shorter than the others so that under the conditions just described, said gouging action will be prevented.

I have found it advantageous to have cutter blades or other contact surfaces as nearly as practicable throughout the entire working face of the tool as this avoids the tendency of the tool to tilt.

It is, however, not essential that all of the cutter blades, except the advance blade, be of the same length. It is desirable that a sufiicient number of blades or a flat working surfaw 20 be provided throughout the major portion of the working face of the head to avoid this tendency for the cutter head to tilt.

In practical use I have found that with my improved tool an unskilled operator may perform a valve reseating operation without gouging the valve seat and without causing the tool to chatter, I have found in practice that with all of the cutter blades arranged in the same plane it is diflicult to prevent the tool from chattering in many cases, and frequently some of the cutter blades will gouge the valve seat and thereby fail to perform a satisfactory valve reseating operation.

I claim as my invention:

1. A valve reseating tool comprising a stem and a cutter head fixed thereto and adapted to rotate about the axis of said stem, one portion of the working surface of the cutter head having formed thereon a series of cutting blades,' the cutting edge of the blade of'said series which is in advance of the other blades during the normal rotation of the cutter being shorter than the remaining blades of the series relative to a plane at right angles to the axis of rotation of the tool, an oppositely disposed portion of the working surface of the cutter head having formed thereon a series of cutter blades having their cutting edges in substantially the same plane as that of the longer blades of the first mentionedseries.

2. A valve reseating tool, comprising a stem, a cutter head fixed to the stem and having a relatively flat working surface, one side of said flat working surface having formed thereon a series of cutter blades, the blade thereof which is in advance of the others during the operative rotation of the head being shorter in its dimension projected from the said. fiat working face than the remaining blades of the series, and. means for preventing the head from tilting when in use on a valve seat having a depression at one side thereof, said means comprising a set of guide blades formed on the working face of the head at the side thereof opposite from said cutting blades and spaced apart therefrom, said guide blades in their dimension'projected from the said flat working face being longer than the said short advance cutter blades to ride upon the side of a valve seat opposite from the said short blade and prevent tilting of the head when the said short blade is passing over a depression in a valve seat. V

RAYMOND P. NORTON. 

